Automatic safety device for boilers.



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AUTOMATIC SAFETY DEVICE FOR- BOIIBRS.

APPLICATION FILED NOV. 3V, 1906.

WARNER S. G. HARRIS, OF SAN LUIS OBISPO,4OALIFORNIA.

.UTOMATIC ySAFETY DEVICE FOR BOILERSf No. 850,751. l

Specification of Letters Patent. Application led November 3, 1906l Serial No. 341,855.

Patented April 16, 1907.

To all w/tm, t Tita/yconcern:

Be it known that I, WARNER S. G. HARRIS, a

l citizen of the United Stateshresiding at San from the boiler is allowed to pass in order to securewhatever indication of the existing condition may be desired. Such indication may be lin the nature of an alarm, as in my previous patent, No. 747,420, December 22, 1903, or it may be, as I now speciallyintend, the cessation of furnace heat caused either by' stopping the supply of fuel, as where v liquid fuel is used, or by putting out the furnace iire when solid fuel is used by water or steam from the boiler thrown u on it.

present invention has for lts object the provision' of a simple safety device of the type mentioned, the construction of which is such as to make it easy to be put in place in the boiler or reset therein after use and capable of such adjustment and regulation as to make it practical under all the circumstances of its use.

To-these ends my invention consists in the novel construction and combination of parts,

which Ishallhereinafter fully describeby reference tothe accompanying drawings, 1n

whichy v A Figure 1 'is an elevation of my safety device, and Fig. 2 is a vertical section of the ready for use.

' the crown-sheet of same, the partsbeing 'shown in a set position 1 is the crown-plate of a boiler, and 2 `'isthe crown-sheet of the furnace. These parts may tion, as they form no part of the invention.

3 is a hollow plug which istapped through lthe furnace and extends i abovesaid` sheet an appreciable distance, so

thatits cavity rises well within the boilerspace, and said plug will thus have lts top exposed above the Water when said water has not reached lits real 'danger-level, butjis low enoughv to make the operation of the device desirable. j The upper end or top ofthe hollow plug 3has a nipple 4, which 1s both kexternally and internally threaded, as shown Yis tapered and Vvalve-body is a ysteam or water vto do whateverworlf it 1s 1n- For example, 1t might lead l be of the usual'or any desired construe-- in Fig. 2. Screwed externally to the nip le 4' is a tube 5, which rises through the boiler nearly to the crown-plate 1. Screwed to the upper end of this tubeis a connecting-tube 6, which passes through the crown-plate 1 in a suitable stuifing-box, (indicated by 7.)

lScrewedupon the u per end of the connecting-tube 6 is the vailve-body 8 of the ordinary differential type, said body having an inlet 9 'and an outlet 10.` In the body is seated the valve 11, having a head 12 and a stem 13.` The stem 13 extends downwardly into the connecting-tube 6, and its lower end 4provided with an internallythreaded socket which screws upon vthe upper end of a rod 14. This rodpassesdown through the connecting-tube 6 and into the tube 5 to its lower end. nipple 4 of the hollow luggS is a nut '15 of Screwed into the some suitable readily usible material. In

this fusiblenut is secured the lower -end of the rod 14.`

Within the connecting-tube 6 is a spring 16, the lower end of which is seated upon 'a shoulder'17 in said tube, and the upper end is seated against a collar 18, fitted to the tapering end of the valve-stem 13. This spring is normally under compression, so 'that its tend-v ency is to lift the valve 11 from its seat; but this it cannot do bedded in the fusible nut 15 below.

In the top of the valve-body S isscreweda 'cap 19'-, through which is threaded a set-screw 20,.-between the head 21. of which and the top of the cap is a lead nut 22, which I shall presently explain.

Suitabl y tapped through the crown-plate -1 -of the boiler is' a steam-pipe 23, which is coupled tothe inlet 9 of the valve-body. Suitably coupled to the outlet 10 ofthe pipe 24, which is to carry the tended to' do. the steam toa whistle, in my former patent Inow intend it may lead to a check-valve in the pipe which conducts the liquid fuel to the burner ofthe furnace in order to cause the steam to close said checkvalve and cut off such as I have shown as long as the rod l14 is einp above referred'to, or, as-

the purpose of ICO the supply of fuel, or, again, it may lead to a sprinkler inthe furnace to enable the water it would then conduct to put out the fire 1n the furnace.

The valve 11 is a double-seated valve, its upper {lange 11. resting on an upper seat in the valve-body and its lower flange 11" rest:

IIO

ing on a loweillsea't. The valve-seat opening is round, while the sides of the valve-are flattened or hexagonal, as shown in Fig. 2, so as to admit the steam-pressure from the `boiler against the under side of the top flangeA 11'; but the steam is prevented by the lower seated flange-11? from passing downwardly into the protecting tubular casing and injuring the parts therein. Thus the boiler-pressure is always on the valve 11,*with a tendencyto lift' it .from its 4seat but the valve cannot rise as long as the rod 14 is anchored in the fusible 'nut 16.y Thisjfusiblel anchor, though here shown as a nut, is not essentially of this form.

It maybe anykind of a fusible anchor.

Describing the device as one'to check the supply of liquid fuel, the operation is as follows: When the level of the water in the boiler is low enough to expose the top of the plu r 3, vthe furnace heat will ymelt the fusible anc or 15, thereby releasing the -rod 14. y*Thereupon 'the boiler-'pressure will lift thevalve 11 from its seat. Steam "will then ass vfrom the boiler through pipe 23, past t e open valve,

and through the pipe 241tov operate the ehecl,

valve in the fuel-supply ipe, thereby cutting ofi"A the fuel and saving t e boiler. The'engi- 4neer being now aware of the condition and f the lead nut22fro1'n under the head' ofthe having remedied it must set vthe valve back to itsseat 'to eut o fl' Vthe no -longer-'needed steampressure.` lj rHe-.does .this by-.cutting out set'- screw 20,.jwhereuponbyturning said screw down he can cause it to-bear upon the head of the valve 11 and force said valve downl toits seat andho'ldit there until such.

timeas the whole device can be conveniently reset by 'putting in another fusible anchor below.

` .The object ofr'the lead nut .22 is to prevent the engineer' 'from tampering with the setf- 1 screw in orderv to throw the device out ofuse without detection. If he cuts the nuit away,

he'must explain the necessity which impelled himtodoso.

The object of vthe sprlng 416 1s to eHect the operationo'f lifting the. valve in case there 1s no boiler-pressure-aa ffor vexample if the'v furnace is fired 'up -whenfthe'reis litt eor no 'waterin the boiler'. kIn such a case as soon as the 'fusible vanchor .is rmelted and [rod 14 thereby released the spring will -throw the valve up.y n

.From the described construction ofthe device it will be seen that it canfbe readily placed inthe boiler and can be reset with facility. The .plug 3, Awith the tubes 5 and 6' secured to itandthe rod14 anchored in it, is.

j vfirst placed/inthe furnacel crown-sheet, with i '6e the tube 6 'pro'ecting up through the boilercrown-plate. he stuHing-box is serewedto place and then the remaining parts are easily fitted'in and upon the tube 6. The valve 1s drpped down into the .valve-body and its Vvso eted stem, withthe collar 18 upon it,

aangaf reaches down to the upper ends of the spring and rod. Now by turning the valve by means of an instrument, such as a, screwdriver, applied to its head the stem of the- `1. An automatic safety device for boilers,

comprising a hollow plug fitted through the crown-sheet ofA the furnace; a valve-holding rod'passing from said plug through the boiler to its'exterior; a readily-fusible anchor securing the lower'end of the rod to the top of the plu a valve-body having an inlet and an out et, avalve thereincontrolling the' passage through said body, and arranged to receive-the fluid-pressure of the body-inlet vunder it,Y to lift it from its seat a connection betweensaid valve and the anchored holdingrod, to hold said valve down against said fluid pressure; Tia-suitable fluid-pressure connection with the inlet to said valve-body; and a delivery-connection with the outlet of-said valvebody,

2i An automatic safety-device for boilers,

comprising a hollow plug fitted through the crown-sheet of the furnace; a casing secured at its lower end to the top of said plug and extending upwardly through the crown-platel of the boiler tov the exterior; a valve-body secured vupon the upper lend of said casing,

having an inlet andlanoutlet, said body havlng an u 'per valve-seat and a lower valveseat; a Duble-flanged valve fitted to said seats, to 'control' the passage through the body, and arranged to'receive the fluid-pressure of the vbody-inlet under its upper flange to liftsaid valve; a rodin th casing',l a readily-fusible anchor securing t e lower end of the'rod to the hollow'plu'g` in the furnace crown-sheet; a connection between the upper end of the rodand the valve to. hold said valve down against the fluid-pressure; a suitable luid-pressure connection. with the inletto said valve-body; andaJ delivery connection with the outlet of said valve-body.

3. An automatic safety device for-boilers, comprising `a hollow plug fitted through the crown-sheet ofthe furnace; a valve-holding rod passing from said plug through the boiler to its exterior;fafreadily-fusible anchor securing the lowerend ofthe rod to the top of vthe, plug; 1a ,valve-body" having an inlet and ICO an outlet;I a valve"therein controlling the passage through'said body, and arranged to receive the fluid-pressure of the body-inlet under it, to lift it its seat aV connection between said valve and the'- anchored holdthe to of the valve-body, adapted to reset the va ve against its lifting pressure.

4. A u automatic safety device for boilers, comprising a hollow plug fitted through the crown-sheet of the furnace; a casing secured.

to the top o'f said plug, and tapped through the crown-plate of the boiler to the exterior; a valve-body secured upon the upper end of the casing, having an inlet and an outlet; a

valve seated in said body to control the passage through it, and arranged to be lifted by fluid-pressure through the inlet; a stem of said valve extending downwardly into the casing; a rod to the upper end of which the valve-stem is secured; said rod extending downwardly inthe casing to the hollow plug; a readily-fusible anchor securing the lower end ofthe rod to said plug whereby the valve is normally held down a pipe connecting the inlet of the valve-body with the boiler; and a delivery-pipe from the outlet of said valvebodv.

5i An automatic safety device for boilers7 comprising a hollow plug fitted -through the crown-sheet of the furnace; a casing secured to the top of said plug and tapped through the crown-plate of the boiler to the exterior; a valve-body secured on the upper end of the casing7 having an inlet and an outlet; a valve seated in said body to control the passage through it7 `and arranged to be lifted by fluidpressure through the inlet; a stem of said valve extending downwardly into the casing; a rod to the upper end of which the valvestem is secured7 said rod extending downwardly into the casing and to the hollow plug; a readily-fusible anchor securing the lower end of the rod to saidv plug, whereby the valve is normally held down; a spring 1n the casing tending to lift said valve; a pipe connecting the inlet of the valve-body with the boiler; and a delivery-pipe from the outlet of said valve-body.

6. An automatic safety device for boilers, comprising a hollow plug fitted to the crownsheet of the furnace7 and having a nipple on its top; a tube screwed to said nipple; a connecting-tube screwed to said nipple-tube and tapped through the crown-plate of the boiler to the exterior; a valve-body screwed to the connecting-tube and having an inlet and an outlet; a valve seated in said body to control the passage through it, and arranged to be lifted by fluid-pressure through the inlet; a stem of said valve extending downwardly into the connecting-tube a rod upon the pper end of which the valve-stem is screwed,

said rod extending downwardly to the nipple of the furnace-plug; a readily-fusible anchor securing the lower end of the rod to said plugnipple; a spring in the connecting-tube tending to open the valve; a pipe connecting' the inlet of the valve-body wlth the boiler; and a 'delivery-pipe from the outlet of said valvebody. K

7. An automatic safety device for boilers, comprising a hollow plug fitted through the crown-sheet of the furnace, and having a nipple on' its top ;`a tube screwed to said nipple; a connecting-,tube screwed to' said nippletube and tapped through the crown-plate of the boiler to the exterior; a valve-body screwed to the connecting-tube and. having an inlet and an outlet; a valve seated in said body to control the passage through it, and arranged to be lifted by fluid pressure through the inlet; a stem of said valve xtendingA downwardly into the connectingtube; a rod upon the upper end of which the valve-stem is screwed, said rod. extending downwardly to the nipple'of the furnaceplug; a readily-fusible anchor securing the lower end of the rod to said plug-nipple; a spring in the connecting-tube tending to open the valve; a set-screw passing through the top of the valve-body to reset the valve against they lifting ressure; a pipe connecting the inlet of t e valve-body `with 'the boiler; and a delivery-pipe from thev outlet of A said valve-body.

8. An automatic safety device for boilers,

comprising a hollow plug fitted through the crown-sheet of the furnace; a casing secured to the top of said plug `and tapped lthrough the crown-plate of the boiler to the exterior;

z a valve-body secured to the top of the casing vand having an inlet and an outlet a valve .seated in said body to control the passage lthrough it and arranged to be lifted by fluidpressure through the inlet; a stern of said valve extending downwardly into the casing; a rod to the upper end of which the valve- .stem is secured, said rod extending downwardly to the furnace-plug; a readily-fusible anchor securing the lower end of the rod to said plug; a spring in the casing tending to IOO IIO

open the valve; a set-screw passing through the top of the valve-body to reseat the valve;

a lead nut under the head ofthe set-screw; a'

pipe connecting the inlet of the valve-body. Withthe boiler; and a delivery-pipe'from the outlet of said valve-body. l In testimony whereof I have'signed my naine to this specification in the presence of two subscribingwitnesses.

WARNER'S, G. HARRIS. Witnesses:

N. A. ACKER, L. WILKINS. 

